Nokia on Wednesday unveiled the Lumia 525, the successor to the Lumia 520, the best selling Windows Phone to date. It has big shoes to fill, to be sure, but thankfully maintains a similar design while improving on some hardware specs.

The phone sports a 4-inch display with an 800 x 480-pixel resolution, a 5-megapixel camera, 8GB and storage and a 1GHz dual-core Snapdragon S4 processor. On that front, it’s the exact same as the Lumia 520, however, Nokia boosted the RAM from 512MB to 1GB in the Lumia 525. It also runs the latest software from Nokia, which is likely why it needed the bump in system memory. Nokia will sell the phone with white, orange and yellow interchangeable shells, too.

It’s not much of an upgrade, to be sure, but Nokia is keeping the most popular Windows Phone handset nice and fresh, which is important as it continues to expand the operating system into emerging smartphone markets. It will launch in Singapore on December 14 for S$249 ($198), and while we expect it will hit other markets (the Lumia 521 ended up at T-Mobile), Nokia didn’t say where just yet.